[9.0](backport #44098) mod: update github.com/elastic/mito to v1.19.0 (#44129)

* mod: update github.com/elastic/mito to v1.19.0 (#44098)

Adds:
* hex_decode function

Also fix links to direct documentation for extension functions.

(cherry picked from commit 4c1bf91)

* remove irrelevant changelog entry

---------

Co-authored-by: Dan Kortschak <dan.kortschak@elastic.co>

Author: mergify[bot]

CHANGELOG.next.asciidoc

@@ -115,6 +115,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Prevent panic in CEL and salesforce inputs when github.com/hashicorp/go-retryablehttp exceeds maximum retries. {pull}40144[40144]
 - Fixed websocket input panic on sudden network error or server crash. {issue}44063[44063] {pull}44068[44068]
 - [Filestream] Log the "reader closed" message on the debug level to avoid log spam. {pull}44051[44051]
+- Fix links to CEL mito extension functions in input documentation. {pull}44098[44098]
 
 
 *Heartbeat*
@@ -218,6 +219,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Add pagination batch size support to Entity Analytics input's Okta provider. {pull}43655[43655]
 - Allow a grace time for awss3 input shutdown to enable incomplete SQS message processing to be completed. {pull}43369[43369]
 - Update CEL mito extensions to v1.18.0. {pull}43855[43855]
+- Update CEL mito extensions to v1.19.0. {pull}44098[44098]
 
 *Auditbeat*
 

NOTICE.txt

@@ -15345,11 +15345,11 @@ limitations under the License.
 
 --------------------------------------------------------------------------------
 Dependency : github.com/elastic/mito
-Version: v1.18.0
+Version: v1.19.0
 Licence type (autodetected): Apache-2.0
 --------------------------------------------------------------------------------
 
-Contents of probable licence file $GOMODCACHE/github.com/elastic/mito@v1.18.0/LICENSE:
+Contents of probable licence file $GOMODCACHE/github.com/elastic/mito@v1.19.0/LICENSE:
 
 
                                  Apache License
@@ -26855,11 +26855,11 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 --------------------------------------------------------------------------------
 Dependency : golang.org/x/oauth2
-Version: v0.25.0
+Version: v0.27.0
 Licence type (autodetected): BSD-3-Clause
 --------------------------------------------------------------------------------
 
-Contents of probable licence file $GOMODCACHE/golang.org/x/oauth2@v0.25.0/LICENSE:
+Contents of probable licence file $GOMODCACHE/golang.org/x/oauth2@v0.27.0/LICENSE:
 
 Copyright 2009 The Go Authors.